e. Lateral buds widely divergent; bud-scales scarious 

 on the margins; lowermost branches of trees grow- 

 ing in the open not drooping nearly to the ground 



[2] Q. imbricaria, p. 121. 



ee. Lateral buds more or less appressed; bud-scales not 

 scarious on the margins ; lowermost branches of 

 trees growing in the open drooping nearly to the 



ground [2] Q. palustris, p. in. 



aa. Terminal buds usually about J4 i ncn l n g (slightly smaller 

 in Q, ellipsoidalis) . 

 b. Buds conspicuously hairy or tomentose. 



c. Buds rusty-hairy, acute at the apex; cup-scales of acorn 

 rusty-tomentose ; inner bark of trunk not yellow ; shrub- 

 by tree, rare in Michigan. ... [2] Q. marilandica, p. 119. 

 cc. Buds hoary-tomentose, obtuse ,at the apex; cup-scales of 

 acorn hoary-pubescent ; inner bark of trunk yellow ; 

 large tree, common 'in Michigan. .[2] Q. velutina, p. 117. 

 bb. Buds glabrous, or pubescent only above the middle. 



c. Buds strictly glabrous throughout, lustrous ; inner bark 

 of trunk yellow or whitish. 



d. Buds obtuse at the apex; trunk provided with pins or 

 stubs of dead branches near the ground; inner bark 

 of trunk yellow ; nut l /2-^. inch long, inclosed for 

 one-third to one-half of its length in a top-shaped 

 cup; kernel of nut yellow. . [2] Q. ellipsoidalis, p. 115. 

 dd. Buds acute at the apex; trunk not provided with pins 

 or stubs of branches near the ground; inner bark of 

 trunk whitish ; nut about I inch long, inclosed only 

 at the base by a shallow,, saucer-shaped cup; kernel 



of nut white [2] Q. rubra, p. 109. 



cc. Buds pale-pubescent above the middle, but usually glab- 

 rous below, not lustrous; inner bark of trunk red 



[2] Q. coccinea, p. 1 13. 



99 



